Pymediainfo

New features
* Add a new `output` option to the `parse` method, this deprecates the old `test` option (82)
* Update bundled MediaInfo to [v20.03](https://github.com/MediaArea/MediaInfoLib/releases/v20.03) (Windows and OSX wheels)
* Add support for os.PathLike objects (72)

Bug fixes
* Close and delete handle on errors to avoid memory leaks (79)
* Fix thread-safety that was broken since v4.1 (76 and 83), document multi-threading limitations
* Document Python 3.8 support
* Show the correct pymediainfo version in documentation builds

* Add an argument to pass custom options to the parse method (71)
* Update bundled MediaInfo to [v19.09](https://github.com/MediaArea/MediaInfoLib/releases/tag/v19.09) (Windows and OSX wheels)

* Drop Python 2.6 compatibility
* Allow pickling of Track instances (68)
* Remove xml attributes from `Track` and `MediaInfo` objects, populate the `tracks` attribute immediately (03f6242bf6d3d7cf0afaa4156397971f152fa922)
* Implement `__eq__` for`Track` and `MediaInfo` objects
* Add an option to obtain MediaInfo's text output (66)
* Add an option to return non-complete MediaInfo (66)
* Disable `LegacyStreamDisplay` explicitly by default, make it configurable (see 9aa65d8387723e6c32c1570d67c4c9c019ad3cbc for details)

* Generate sdists on Linux instead of OSX (67)

* Publish wheels containing libmediainfo (59, thanks to bgermann)

* Add an option to control parsing speed (65)